3D correlation imaging of magnetic total field anomaly and its vertical gradient

3D correlation imaging of magnetic total field anomaly and its vertical gradient
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磁总场异常及其垂直梯度的3D相关成像

DOI:
10.1088/1742-2132/8/2/013
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发表时间:
2011-06
影响因子:
1.4
通讯作者:
郭良辉
郭良辉
中科院分区:
地球科学4区
文献类型:
--
作者:
郭良辉

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我们提出了一种新的 3D 相关成像方法,用于磁总场异常及其垂直梯度,用于导出地下的 3D 等效磁偶极子分布。在这种方法中,我们将地下空间划分为3D规则网格,然后在每个网格节点计算观测到的磁总场异常(或其垂直梯度)与由磁偶极子引起的理论磁总场异常(或其垂直梯度)之间的互相关性。所得的相关系数用于描述概率意义上的等效磁偶极子分布。该方法在多个矩形棱柱模型的合成磁数据和中国长江中下游铁矿区的真实航磁数据上进行了测试。结果表明,该方法得到的等效磁偶极子分布基本反映了地下磁源,也说明垂直梯度方法比单独磁总场异常方法能得到更高的等效磁源分布分辨率。
We present a new 3D correlation imaging approach for magnetic total field anomaly and its vertical gradient for deriving a 3D equivalent magnetic dipole distribution in the subsurface. In this approach, we divide the subsurface space into a 3D regular grid, and then at each grid node calculate cross correlation between the observed magnetic total field anomaly (or its vertical gradient) and the theoretical magnetic total field anomaly (or its vertical gradient) due to a magnetic dipole. The resultant correlation coefficients are used to describe the equivalent magnetic dipoles distribution in a probabilistic sense. The approach was tested both on the synthetic magnetic data of a model of multiple rectangular prisms and on the real aeromagnetic data from an iron-ore deposit area in the middle–lower reaches of the Yangtze River, China. The results show that the equivalent magnetic dipole distribution derived by the approach basically reflects the subsurface magnetic sources and also illustrate that the approach for the vertical gradient produces a higher resolution of the equivalent magnetic source distribution than that for magnetic total field anomaly alone.
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